Actually, I did not speak about empty lungs originally. It is not that necessary. Reverse packing might make also Frenzel complicated, if you do not keep sufficient amount of air in the mouth. Better way is compensating while keeping the epiglottis closed - you can do it by closing the throat (epiglottis) while exhaling. Inhale, then create overpressure behind the closure (pushing against the closed throat), so that you can clearly feel immediately when the epiglottis accidentally or involuntarily opens. Then try compensating while keeping the epiglottis closed (and holding the overpressure behind it). If the epiglottis opens, you'll clearly feel the drop in resistance inside your throat and the drop of pressure in your lungs.
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